Descripción: This book, framed in the processes of engineering analysis and design, presents concepts in mechanics of materials for students in two-year or four-year programs in engineering technology, architec...
Popular Mechanics is a classic magazine of popular technology. Popular Mechanics features regular sections on automotive, home, outdoors, science, and technology topics.
operating system. A lot of these programs where very successfully sold during the last years. Welding software can be divided into the following groups: · Calculating of Welding Costs · D…Full description
Cornell University CHEM 2090 Prelim 1 2015
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Examen del Centro Pre-Uni. unprg
TECHNOLOGICAL INSTITUTE OF THE PHILIPPINES -MANILA ENGINEERING MECHANICS COMPETENCY EXAM _______________________ NAME. _______________________ Date: NOVEMBER 21, 201 I!"t#$%t&#: ENGR' L'A' CARRILLO Give the step by step solution to problem solving Instruction: questions 1. A rectangle is 3 in. by 6 in. Determine the polar moment of inertia and the radius of gyration ith respect to a polar a!is through one corner. a. "# in b. 1"6 in c. $16 in d.$%& in
,. As shon in )ig. *("#& to blocs each eighing $& 9 and resting on a hori8ontal surface are to be pushed apart by a 3&7 edge. 'he angle of friction is 1"7 for all contact surfaces. 4hat value of * is required to start movement of the blocs o ould this anser be changed if the eight of one of the blocs ere increased by 3& 9 a. ".&# 9 b. 6.%" 9 c. %.&" 9 d. %.3$ 9
$. Determine the moment of inertia of the '(section shon in )ig. *( +1, ith respect to its centroidal -o a!is. a. $,&.% in b.$6".# in c. $#".+ in d. $$&.1 in
F()$#e -* 3. A stone is dropped don a ell and " sec later the sounds of the splash is heard. /f the velocity of sound is 11$& ft0sec 3#1.3%6 m0s2 hat is the depth of of the ell a. $3".6" ft c. 3&".+, ft. b. 3"3.31 ft d. #1&.$" ft. #. A ball is shot vertically into the air at a velocity of 1,3.$ ft per sec "+., m per sec2. After # sec another ball is shot vertically into the air. 4hat initial velocity must the second ball have in order to meet the first ball 3+6.# ft 11%.+ m2 from the ground a. 3".+, m0s c. #+.36 m0s b. "%.1$ m0s d. notg
;ined problems 1& ( 1$ /n the structure structure shon in )ig. )ig. *(&&6 *(&&6)<( )<(2 2 all member memberss are assumed to be solid rigid members. 'he system is pinned to the all at point A and supported by a roller at point =. >alculate the force on member 1&2 ?D and the reactions at 112 A and 1$2 =. 1&. ?D a. #3$.6% 9 b. #"6.+, 9 c. #+,.$" 9 d. notg 11. shon in )ig. )(&&$@@2 are pinned together at point ? and are pinned to the floor at points A and >. 'he structure supports a pulley at point ? ith hich a person is hoisting a $.& 9 load. @ember ?> has a eight of 1.6 9 hich may be considered to act at its center hile A? is made of strong(light materi material al and has neglig negligibl iblee eight eight.. Determ Determine ine the value value of the e!ternal support reactions at A and > 13. upport at A a. $.%3 9 b. 3.#$ 9 c. 3."# 9 d. notg 1#. upport at >
". A pro5ectile is fired up the inclined plane at an initial velocity of 1" m0s. 'he plane is maing an angle of 3&7 from the hori8ontal. /f the pro5ectile as fired at 3&7 from the incline compute the ma!imum height 8 measured perpendicular to the incline that is reached by the pro5ectile. 9eglect air resistance. a. 3.31 m b. 3.+$ m c. 6.6$ m d. %.6# m 6. )ind the coordinates of the centroid of the shaded area shon in )ig. *(%$# a. ".# ".#%" %" %.$36 .$3622 b. %.%36 ".&%"2 c. +.$#" ".$3#2 d. ,.$#% ".$3#2 %. 4hat eight 4 is necessary to start the system of blocs shon in )ig. *("1& moving to the right 'he coefficient of friction is &.1& and the pulleys are assumed to be frictionless. a. $,." 9 b. 3$.# 9 c. 3+.# 9 d. notg
+. A plan 1& ft long is placed in a hori8ontal position ith its ends resting on to inclined planes as shon in )ig. *("3&. 'he angle of friction is $&7. Determine ho close the load * can be placed to each end before slipping impends. a. 3 ft b . 6 ft c . + ft d. &.%6 ft
a. $.%3 9
b. 3.#$ 9
c. 3."# 9
d. notg
;ined problems 1"($& Bse the method of sections to compute for the force in members D) =) =) and =G of the cantilever truss described in *roblem #11 and )ig. *(#11. D) C 3"&.6 9 ' D= =) C 33".# Ent >= =G C #"& 9 > A>
;ined *roblems 1+($& 'he three(step pulley shon in )ig. *($#% is sub5ected to the given couples. >ompute the value of the resultant couple. Also determine the forces acting at the rim of the middle pulley that are required to balance the given. >< %6& lb.in clocise ) 63.3 lb 'he truss pinned to the floor at D and supported by a roller at point A is loaded as shon in )ig. '(&6. Determine the force in member >G. >G +.&1 9 '
